write the valency electrons, group numbers and periodic number of O, MG, H, F
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valency of
O- 2
Mg- 2
H-1
F-1
valence electrons of
O - 6
Mg - 6
H - 1
F - 7
Group numbers of
O - 16
Mg - 12
H - 1
F - 17
Period numbers of
O - 2
Mg - 3
H - 1
F - 2
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